and future, e&longs;pecially if the time be for many Moneths or Years; I
<lb/> am therefore forced, with other Ob&longs;ervations, and more exact than
<lb/> the former, and in times more remote from one another, to correct
<lb/> the Tables of &longs;uch Motions, and limit them even to the &longs;horte&longs;t mo­
<lb/> ment: for &longs;uch exactne&longs;&longs;e my fir&longs;t Ob&longs;ervations &longs;uffice not; not only
<lb/> in regard of the &longs;hort intervals of Time, but becau&longs;e I had not as then
<lb/> found out a way to mea&longs;ure the di&longs;tances between the &longs;aid Planets
<lb/> by any In&longs;trument: I Ob&longs;erved &longs;uch Intervals with &longs;imple relation
<lb/> to the Diameter of the Body of <emph type="italics"/>Jupiter<emph.end type="italics"/>; taken, as we have &longs;aid, by
<lb/> the eye, the which, though they admit not errors of above a Minute,
<lb/> yet they &longs;uffice not for the determination of the exact greatne&longs;s of the
<lb/> Spheres of tho&longs;e Stars. </s><s>But now that I have hit upon a way of ta­
<lb/> king &longs;uch mea&longs;ures without failing, &longs;carce in a very few Seconds, I will
<lb/> continue the ob&longs;ervation to the very occultation of <emph type="italics"/>JVPITER,<emph.end type="italics"/>
<lb/> which &longs;hall &longs;erve to bring us to the perfect knowledge of the Moti­
<lb/> ons, and Magnitudes of the Orbes of the &longs;aid Planets, together
<lb/> <arrow.to.target n="marg1394"></arrow.to.target>
<lb/> al&longs;o with &longs;ome other con&longs;equences thence ari&longs;ing. </s><s>I adde to the&longs;e
<lb/> things the ob&longs;ervation of &longs;ome ob&longs;cure Spots, which are di&longs;cover­
<lb/> ed in the Solar Body, which changing, po&longs;ition in that, propounds
<lb/> to our con&longs;ideration a great argument either that the Sun revolves in
<lb/> it &longs;elfe, or that perhaps other Starts, in like manner as <emph type="italics"/>Venus<emph.end type="italics"/> and
<lb/> <emph type="italics"/>Mercury,<emph.end type="italics"/> revolve about it, invi&longs;ible in other times, by rea&longs;on of their
<lb/> &longs;mall digre&longs;&longs;ions, le&longs;&longs;e than that of <emph type="italics"/>Mercury,<emph.end type="italics"/> and only vi&longs;ible when
<lb/> they interpo&longs;e between the Sun and our eye, or el&longs;e hint the truth
<lb/> of both this and that; the certainty of which things ought not to be
<lb/> contemned, nor omitted.</s></p>
<p type="margin">
<s><margin.target id="marg1394"></margin.target>The Authors
<lb/> Ob&longs;ervations of
<lb/> the Solar Spots.</s></p>
<p type="main">
<s><emph type="italics"/>Continuall ob&longs;ervation hath at la&longs;t a&longs;&longs;ured me that the&longs;e Spots are
<lb/> matters contiguous to the Body of the Sun, there continually produced
<lb/> in great number, and afterwards di&longs;&longs;olved, &longs;ome in a &longs;horter, &longs;ome in a
<lb/> longer time, and to be by the Conver&longs;ion or Revolution of the Sun in it
<lb/> &longs;elfe, which in a Lunar Moneth, or thereabouts, fini&longs;heth its Period,
<lb/> caried about in a Circle, an accident great of it &longs;elfe, and greater for
<lb/> its Con&longs;equences.<emph.end type="italics"/>
<lb/> <arrow.to.target n="marg1395"></arrow.to.target></s></p>
<p type="margin">
<s><margin.target id="marg1395"></margin.target>The occa&longs;ion in­
<lb/> ducing the Au­
<lb/> thor to write
<lb/> this Treati&longs;e.</s></p>
<p type="main">
<s>As to the other particular in the next place. ^{*} Many cau&longs;es have
<lb/> moved me to write the pre&longs;ent Tract, the &longs;ubject whereof, is the
<lb/> Di&longs;pute which I held &longs;ome dayes &longs;ince, with &longs;ome learned men of
<lb/> this City, about which, as your Highne&longs;&longs;e knows, have followed
<lb/> many Di&longs;cour&longs;es: The principall of which Cau&longs;es hath been the
<lb/> Intimation of your Highne&longs;&longs;e, having commended to me Writing,
<lb/> as a &longs;ingular means to make true known from fal&longs;e, reall from appa­
<lb/> rent Rea&longs;ons, farr better than by Di&longs;puting vocally, where the
<lb/> one or the other, or very often both the Di&longs;putants, through too
